Dyno Results Compilation
05-23-2013, 01:58 AM
#876
Un-Registered User
All,
Curious on your thoughts on this set of runs, it bothers me how it does not rise in HP much if at all after what looks like the SSV (?) opens. I tried to read through the thread, but lost on whether this may be the SSV, Coils, Fuel Pump, etc. The car is a 2004 with 120k miles on it, but only about 5k on a rebuilt engine. I rebuilt the engine last year and ported it with the RB templates. Have the following other upgrades:
- RB Intake
- BHR Midpipe w/ Cat
- RB Exhaust
- RB Header
- BHR Coils
- MM Cobb Tune
Engine runs great, pulls strong, but the dyno results about 7500 don't look great. Thoughts?
Attachment 195839
Curious on your thoughts on this set of runs, it bothers me how it does not rise in HP much if at all after what looks like the SSV (?) opens. I tried to read through the thread, but lost on whether this may be the SSV, Coils, Fuel Pump, etc. The car is a 2004 with 120k miles on it, but only about 5k on a rebuilt engine. I rebuilt the engine last year and ported it with the RB templates. Have the following other upgrades:
- RB Intake
- BHR Midpipe w/ Cat
- RB Exhaust
- RB Header
- BHR Coils
- MM Cobb Tune
Engine runs great, pulls strong, but the dyno results about 7500 don't look great. Thoughts?
Attachment 195839
06-13-2013, 08:44 AM
#878
Registered
Aaagh. Horrible, horrible result on my newly-acquired 2011 17,000 mile R3 (K&N air filter, Milltek catback), at least 10 bhp down on my 2009 R3 (30,000m, K&N, RB catback) on the same DynoDynamics dyno 
:
Note: power is at flywheel; based on 2009 car's run, the power at the wheels is around 160bhp
The shape above 6000 rpm is horrible.
Just edited to highlight that power is at flywheel; at wheels is about 160bhp.
Edited again to say 4th gear
:Note: power is at flywheel; based on 2009 car's run, the power at the wheels is around 160bhp
The shape above 6000 rpm is horrible.
Just edited to highlight that power is at flywheel; at wheels is about 160bhp.
Edited again to say 4th gear
Last edited by Ian_D; 06-13-2013 at 11:16 AM. Reason: Highlight power
06-13-2013, 11:40 AM
#886
LoL
Well it is what it is ...
Still seems to be a bit of a stumble around 6250 when the APV opens.
The dip is expected but that flat blip is odd IMO and it correlates with the drop in the torque.
However there's typically a drop in torque there as well.
Likely over analyzing it
Well it is what it is ...
Still seems to be a bit of a stumble around 6250 when the APV opens.
The dip is expected but that flat blip is odd IMO and it correlates with the drop in the torque.
However there's typically a drop in torque there as well.
Likely over analyzing it
06-26-2013, 01:47 AM
#889
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Hi guys,
I've been following this thread for a while, and have been to the dyno a few times trying to figure out why my car makes peak power just past 7k rpm and looks weak over 7500. The car drives fine, but I care about the last few HP because I compete in autocross (STX class). At this point I'm out of things to try, so I'm hoping you guys might have some ideas.
Here's the most recent dyno plot (in 5th gear).
Car is an '06 US-market 6MT shinka with 52k miles. The drivetrain is completely stock except for a K&N panel filter, BHR ignition kit, and a Racing Beat Rev8 exhaust.
Here's what I know
* I dyno'd the car before and after installing the BHR kit & fresh plugs. Before: power trailed off dramatically past 8000. After: curve looked like the above chart.
* I removed the stock catalytic converter & visually inspected (pic). No clogging that I could see, waffle pattern appeared undamaged.
* Measure vacuum at idle from LIM nipple at 17 inHG of vacuum (8.3 PSI)
* Compression test came back at rotor1: 6.9, 6.7, 6.9 @ 274, rotor2: 7.0, 6.9, 7.0 @ 271
* Using a vacuum pump, SSV and VDI appear to actuate correctly - fully open at 7 inHG of vacuum (3.4 PSI) and held vacuum for at least 30s (at which point I got bored)
* I can hear the APV cycling after shutting off the car.
* No CELs or error codes.
* I've done 3 dyno sessions spanning a year, and the "normal" part of the graph (< 7k rpm) has gotten slightly worse each time - not sure if this is related, a separate problem, or just noise.
* Ambient temperature is always around 80F, and elevation is a few feet above sea level.
* At some point in time after the first dyno, I cleaned the MAF.
Compression is low, but I thought that mainly affected low-end power?
Prior to the last dyno session, I took it to a local rotary mechanic for the compression test followed by a decarb. He mentioned that there was a lot of crud on the plugs and recommended that I go one step colder for the leading plug. He installed the new plugs, so I'm not sure of the part numbers, but he said the leading plugs were now the same as the trailing. I'd noticed brown crud on the plugs in previous plug swaps (pic), but assumed it was normal?
During the last dyno session, I also logged data from OBD, available here.
In those logs, I see MAF readings of 4.7 g/s at idle and peaking around 208 @ 8700 rpm, which I think is normal? I don't know what to make of the fuel trim and timing advance numbers.
Thoughts?
I've been following this thread for a while, and have been to the dyno a few times trying to figure out why my car makes peak power just past 7k rpm and looks weak over 7500. The car drives fine, but I care about the last few HP because I compete in autocross (STX class). At this point I'm out of things to try, so I'm hoping you guys might have some ideas.
Here's the most recent dyno plot (in 5th gear).
Car is an '06 US-market 6MT shinka with 52k miles. The drivetrain is completely stock except for a K&N panel filter, BHR ignition kit, and a Racing Beat Rev8 exhaust.
Here's what I know
* I dyno'd the car before and after installing the BHR kit & fresh plugs. Before: power trailed off dramatically past 8000. After: curve looked like the above chart.
* I removed the stock catalytic converter & visually inspected (pic). No clogging that I could see, waffle pattern appeared undamaged.
* Measure vacuum at idle from LIM nipple at 17 inHG of vacuum (8.3 PSI)
* Compression test came back at rotor1: 6.9, 6.7, 6.9 @ 274, rotor2: 7.0, 6.9, 7.0 @ 271
* Using a vacuum pump, SSV and VDI appear to actuate correctly - fully open at 7 inHG of vacuum (3.4 PSI) and held vacuum for at least 30s (at which point I got bored)
* No CELs or error codes.
* I've done 3 dyno sessions spanning a year, and the "normal" part of the graph (< 7k rpm) has gotten slightly worse each time - not sure if this is related, a separate problem, or just noise.
* Ambient temperature is always around 80F, and elevation is a few feet above sea level.
* At some point in time after the first dyno, I cleaned the MAF.
Compression is low, but I thought that mainly affected low-end power?
Prior to the last dyno session, I took it to a local rotary mechanic for the compression test followed by a decarb. He mentioned that there was a lot of crud on the plugs and recommended that I go one step colder for the leading plug. He installed the new plugs, so I'm not sure of the part numbers, but he said the leading plugs were now the same as the trailing. I'd noticed brown crud on the plugs in previous plug swaps (pic), but assumed it was normal?
During the last dyno session, I also logged data from OBD, available here.
In those logs, I see MAF readings of 4.7 g/s at idle and peaking around 208 @ 8700 rpm, which I think is normal? I don't know what to make of the fuel trim and timing advance numbers.
Thoughts?
Last edited by scott.g; 06-26-2013 at 01:49 AM.
06-27-2013, 02:15 AM
#892
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06-27-2013, 02:44 AM
#893
a 208g\s maf reading is fairly low too. My NA engine pulled around 270g\s at around the same rpm.
I'm not twisting the knife in your cut, just be happy to get the chance to either get a reman engine or build one the right way. The performance "increase" will be very noticeable and you'll enjoy many successful autoX runs
06-27-2013, 03:35 AM
#894
Your engine is below spec, you should be able to get a reman.
a 208g\s maf reading is fairly low too. My NA engine pulled around 270g\s at around the same rpm.
I'm not twisting the knife in your cut, just be happy to get the chance to either get a reman engine or build one the right way. The performance "increase" will be very noticeable and you'll enjoy many successful autoX runs
a 208g\s maf reading is fairly low too. My NA engine pulled around 270g\s at around the same rpm.
I'm not twisting the knife in your cut, just be happy to get the chance to either get a reman engine or build one the right way. The performance "increase" will be very noticeable and you'll enjoy many successful autoX runs
Last edited by Brettus; 06-27-2013 at 03:39 AM.
06-27-2013, 03:55 AM
#897
A well tuned engine on a modified car doesn't struggle to see those numbers.
06-27-2013, 04:18 AM
#900
Perhaps there's a difference in the readings of a scaled MAF vs those of a non-scaled one?